Retune my entire carb after installing new heads?

Doc,
The totality of the airflow at idle & low speed cruise is thus.
- leakage from t/shafts
- air from idle air bleeds
- leakage around t/blades, pri & sec
- air on atmospheric side of T/slot
- PCV.

The engine doesn't know or care where the air comes from, as long as it gets enough to run.
Both QJ & later TQ carbs have bypass air that enters the airhorn, passes through body cavities & exits under the t/blades. With no air passing the venturiis, this ensures no nozzle drip.
Tuning with an A/F gauge, you have no way of knowing what the extra flow from holes in the sec blades is doing for overall jetting requirements. The only way to make sure the jetting is working as designed is to plug the holes in the sec blades.
To supply bypass air, remove the PCV & rig up some sort of variable fitting connected to the PCV port. You can vary the flow to get the desired idle rpm. Then test drive.